Hard Disk Data Recovery and Erasure

2010-10-22 Hard Disk Data Recovery and Erasure Presented by Åke Ljungqvist IBAS Ltd The Ibas Group  Norway…  Recovery of hard disks after fire exp...
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2010-10-22

Hard Disk Data Recovery and Erasure Presented by Åke Ljungqvist IBAS Ltd

The Ibas Group  Norway…  Recovery of hard disks after fire exposure…  Unforeseen costs…

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2010-10-22

About Ibas • Founded in 1978 • Owner: Kroll Ontrack • Business areas - Data recovery - Data erasure - Computer Forensics

• Number of employed (Nordic countries): 68

• World wide (Ontrack) • Global customer service: 24/7/365

Data Recovery

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Data recovery – when you missed to make a backup... • Large amounts of data are stored on hard disks • Technology is stressed to its limit in order to squeeze in more data

4.000 A4 binders or 1.480.000 A4 pages equals 4 GB of data

Data recovery – when you missed to make a backup • Large amounts of data are stored on hard disks • Technology is stressed to its limits in order to squeeze in more data •

Hard disks break down



Backup systems fail or are missing



Human error!

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Data recovery- in practice?

Data recovery - step by step Analysis Economy 4-6 days 1 290 SEK Standard 2 days 2 500 SEK Express 7 hours 9 500 SEK

Report

Order

Type of Problem Order from Amount of data customer Delivery time Cost

Reconstr. Economy 6-10 days 7-15 000 SEK Standard 3-5 days 15-30 000 SEK Express 24 hours 30-60 000 SEK

Delivery TNT JetPak Post Taxi Via Internet

All data handling and management is confidential, done by employees with a SÄPO security clearance

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Physical damage on hard disks • Head crash (1) (2) (3) • What is that “click sound”? (disk OK) (disk defect) • Shock damage – often happens to portable computers • Electronics • Mechanical damage • Water (4)(5) • Fire/soot (6)

Logical damage – hard disks • Viruses • Removed files • Partial overwrite

• Lost/corrupt system information • Loss of specific data due to physical damage

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Typical damage – backup-tapes Physical damage

• Entanglement • Breaches • Mechanical failures on tape recoders Logical damage

• Overwriting with a new backup • Logical damage in header and raw data

Recovery of flash memories Pictures/music/data etc from all types of flash memories on the market can be recovered, e.g.:

• • • • • •

CompactFlash MemoryStick SmartMedia MultiMedia

SecureDigita USB memories

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Photo by Helena Larsson Naturfotograferna

Data Erasure

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Advice to the user… • • • •

Don’t panic! Disconnect the power Don’t attempt a re-start

Don’t re-install the Operating System or application S/W

• Don’t open the hard disk • Make a thorough assessment of the situation

Data erasure Protecting information in use is natural • Firewalls • Encryption • Passwords • Remote login security But what happens to the information when we throw away our computers….? A TV news flash

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Why data erasure? • SECURITY – correct methodology prevents information leakage • ECONOMY – re-use is economic - premature disposal is costly • ENVIRONMENT - functioning hard disks make re-use possible • PUL – Legal requirements

Why data erasure? • SECURITY – correct methodology prevents information leakage • ECONOMY – re-use is economic - premature disposal is costly • ENVIRONMENT - functioning hard disks make re-use possible • PUL – Legal requirements

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Data erasure – How? FUNCTIONING hard disks  OS-tools (Formatting/deletion)  Not intended for complete erasure  Dependent on the Operating System  Tools for file removal  Overwrites part of the hard disk  Dependent on the Operating System  Disk sanitizers  Overwrites the whole the hard disk  Independent on the Operating System  Independent of the BIOS

What do we want to achieve? • All magnetic storage is based on a single principle, i.e.: • Data is stored by changing the polarity of magnetic domains

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System overview: OS Tool

USER APPLICATION

Sanitizing Tools

OS Buffer Memory OntrackEraser

HOST SYSTEM

BIOS

HARD DISK

Sector Buffer uC+Firmware Media

Erasure report - traceability Ontrack Eraser Report -----------------------------------------------------------Time of erasure Fri Sep 07 16:27:30 2007 Time of report upload Fri Sep 07 16:00:26 2007 Software Version 3.0.1.2 Overwrites 1 Verify False Pattern SEKollOntrack Algorithm Report Security Hash eba2f7cead6157a219ceaf13cf410403 Customer Defined Fields: Media -----------Disk #1 Model ST3160828AS40Y9046LEN Serial Number 4MT26SCK Capacity 160041885696 Block Size 512 Type Erasure Status Success Unlock Success Lock type No locking ----------------

Model IBM Manufacturer IBM Version 0 Serial 65453168416871 BIOS: Vendor IBM Version 2EKT32AUS (12/16/2005) RAM: Slot J10 Size 0 Slot J3 Size 536870912 Slot J4 Size 0 Slot J9 Size 536870912 Slot System board or motherboard Size 1073741824 CPU: Slot LGA775/PSC/TJS Product Intel(R) Pentium(R) 4 CPU 3.40GHz Vendor Intel Corp. Capacity 3800000000 Width 64 Size 3400000000

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Data erasure – How? Defect hard disks and other media  Saturation of the magnetic layer  Fast and secure method when data must not be re-used  Erasure of hard disks, band och floppy disks  Compliant to the Department of Defence standard (DoD 5220.22M) and Swedish military requirements

How does”data” look?

A data track on a hard disk before degaussing

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How does”data” look?

A data track on a hard disk after degaussing

Hard disks in reality

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Return

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Thank you! Åke Ljungqvist 070-397 10 55 [email protected]

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